Improved apparatus for grinding and amalgamating ores



2 sh t-sh u. M. B. DoDGE. @es Se l UreAmalgamator. y y No. 47,808. yPatented May 23, 1865.

Witnesses: l Invento r,

AM. PHDTD'LlTHO.C0.N.Y. IOSBORNE'S PROCESS) 2 Sheets-Sheet 2. IVI. BfDODGE.

Ore Amalgalmamrl No. 47,808. l `Patented May'23,1865.

Witnesses: Inventor' AM. PHOTO-LITHD.C0. N-Y. (DSBORNS PROCESS.)

UNITED STATES PATENT OFFICE.

M. B. DODGE, OF NEW YORK, N. Y.

IMPROVED APPARATUS FOR GRINDING AND AMALGAMATING ORES.

Specification forming part of Letters Patent No. 17,80 S, dated May 23,1865.

To all4 whom it 'may concern:

Be it known that I, M. B. DODGE, of the city, county, and State of NewYork, have invented a new and Improved Ore-Grinder and Anialgamator; andI do hereby declare that the following is a full, clear, and exactdescription thereof, which will enable those skilled in the art to makeand use the same, reference being had to the accompanying drawings,forming part of this specification, in which- Figure 1, Sheet No. 1, isa vertical section of my invention, taken in the line :c x, Fig. 2 5Fig. 2, a plan or top view of the same; Fig. 3, a detached inverted planor face view of the muller; Fig. 4, a detached plan or top view of oneof the shoes of the muller; Fig. 5, a section of Fig. 4, taken in theline y y; Fig. 6, a plan or top view of the pan of the device, themuller being removed.

Similar letters of reference indicate corresponding parts.

This invention relates to a new and improved machine for grinding andamalgamating, for grinding ores in a dry state, and for amalgamating theprecious metals contained therein to separate said metals from theforeign substances of the ore.

The invention consists in an im proved manner of attaching the shoes tothe muller, as hereinafter set forth, whereby said shoes are enabled toadjust themselves to the bed or bottom of the pan, thereby compensatingfor the wear of the shoes and causing the parallelism of the latter withthe bed or pan bottom to be preserved at allv times, which adds greatlyto the efficiency of the machine, as will be presently shown.

A represents a pan, in which the ore to be ground or amalgamated isplaced. This pau may be of cast-iron of circular form, slightly inclinedat the side, and having a bottom, B, slightly concave at its uppersurface. This bottom B is composed of a series of Vlshaped plates, a,bolted to a plate, a, as shown in Fig. 4. These plates a may be ofcast-iron, and they compose the stationary bed at the bottom of the panon which the muller works.

C is the muller, which consists of a circular plate, b, slightlyconcave, corresponding tov the upper surface of the bottom B of thelpan, (sce Fig. 1,) said muller being formed or cast with a central tube,D, which is.

fitted on a shaft, E, projecting vertically Y their front convex sidesrounded, as shown i at c, Fig. 5, to admit of the ore to be ground oramalgamated passing readily underneath them. The shoes F are not incontact, spaces being allowed between them, as shown clearly in Fig. 3.The shoes F are attached to the plate b of the muller as follows: Eachshoe is provided with an upright projection, d, and these projectionsextend up through slots e in the plate b and between lugs or ears f atthe upper side of said plate, and have pins g passing through them. Eachshoe, therefore, it will be seen, works on a center, its pin g, andhence is rendered capable of adjusting itselfl to compensate for wear..The outer parts of the shoes F, it will of course be seen, have muchmore work to perform than the inner parts, and hence are sub-- jected tomore wear, and if some means were not employed to compensate for thiswear the parallelism of the shoes and the panbotto1n would not bepreserved and the device would operate very imperfectly-a contingencyfully obviated by .my invention. Each shoe :is provided with twoguide-pins, h, which work in holes i in the plate b. This mode ofpivoting the shoes to the plate b of the muller enables the latter to bemade strong and durable and capable of being used for grinding dry ore.The feature of self-adjusting shoes is not new, ,the same may be seen inan amalgamator patented by me May 8, 1864:. This patented machineanswers a good purpose for amalgamating, but it cannot be made as strongand durable for grinding dry ores as would be desirable.

A spring may be applied to the shoes to assist in adjusting them; but Ido not deem them strictly necessary.

I do not claim, broadly, the employment or Work or adjust themselvesfrom a center or use of self-adjusting shoes applied to a muiler from ahinge or pivoted point with or Without of an amalgamator andore-grinder; but springs, substantially as set forth.

I do claim as new and desire to secure by M. B. DODGE. Letters Patent-Witnesses:

The attaching ofthe shoes to the muller by M. M. LIVINGSTON, pivots7 orin such a manner that they will C. L. TOPLIFF.

